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In the documentation of GLSL - reflect given a surface normal $N$ and an incident vector $I$ the calculation being performed is reported as $$ \text{reflect}(I,N) = I - 2\text{dot}(I,N)N $$

I wonder if this math is correct because in my calculations the sign should be swapped.

Can anyone confirm?

Maybe if $I$ is not incident but outgoing from the point of application the sign would be swapped?

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    $\begingroup$ This question pops up from time to time here, the math is correct. $\endgroup$
    – pmw1234
    Dec 26, 2023 at 23:37

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